Bathtub closure



FIG. 1 is a front perspective view of a bathtub closure, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a front perspective exploded view thereof.

The broken lines in the figures illustrate unclaimed portions of the bathtub closure. 

CLAIM The ornamental design for a bathtub closure, as shown and described. 